Anki 2.1 tag toggler

tag_toggler.py

from aqt import mw
from aqt.reviewer import Reviewer

class TagTogglerReviewer(Reviewer):
    # Keep Python from complaining that self.shortcuts doesn't exist. 
    shortcuts = []

    def __init__(self, mw):
        super().__init__(mw)

        # Reviewer's default shortcuts, plus our own
        self.shortcuts = super()._shortcutKeys() + [
            ("h", lambda: self._toggleTag("blah")),
        ]

    def _shortcutKeys(self):
        """
        Return our shortcuts rather than the default ones.
        """
        return self.shortcuts

    def _toggleTag(self, tag):
        """
        Our own custom tag toggler
        """
        f = self.card.note()
        if f.hasTag(tag):
            f.delTag(tag)
        else:
            f.addTag(tag)
        f.flush()

# Use our modified Reviewer rather than the default one.
mw.reviewer = TagTogglerReviewer(mw)